<?php
/*
 * $img=new CImage(72,22,15);
 * $img->printimg('png');
 */

if (!session_id()) session_start();
class CImage{
	public $width;
	public $heigth;
	public $sessionName='_jms_vcode';
	public $type='png';
	public $charlen=4;
	public $fontSize=15;
	public $ttf;
	
	private $img;
	private $chars="0123456789";
	
	function __construct($width=48,$heigth=18,$fontSize=15){
		$this->width=$width;
		$this->heigth=$heigth;
		$this->fontSize=$fontSize;
		$this->img=imagecreate($this->width,$this->heigth);
		$this->ttf=dirname(__FILE__).'/fonts/F2FOCRBczykLTStd-Regular.otf';
		//$var_dump($this->ttf);
		imagefill($this->img,0,0,imagecolorallocate($this->img,230,235,255)); 
	}
	
	function writeChar($code){
		$charlen=strlen($this->chars);
		$fontLeft=-12;
		for($i=0;$i<strlen($code);$i++){
			$fontSize=mt_rand(-1,1)+$this->fontSize;
			$fontLeft+=$fontSize+mt_rand(0,2);
			$fontTop=$this->heigth-mt_rand(1,5);
			$col=imagecolorallocate($this->img,rand(0,150),rand(0,150),rand(0,150));
			imagettftext($this->img, $fontSize, mt_rand(-20,20), $fontLeft, $fontTop, $col, $this->ttf, $code{$i});
		}
	}
	
	function writeArc($i){
		while($i--){
			ImageArc($this->img,rand(1,$this->width),rand(10,$this->heigth),rand(20,$this->width),rand(1,$this->heigth),rand(1,360),300, imagecolorallocate($this->img,rand(0,120),rand(0,120),rand(0,120)));
		}
	}
	
	function writePix($i){
		while($i--){
			imagesetpixel($this->img,rand(0,$this->width),rand(0,$this->heigth),imagecolorallocate($this->img,rand(0,200),rand(0,200),rand(0,200)));
		}
	}
	
	function printimg($type){
		header("content-type:image/$type");
		/*
		$len=strlen($this->chars);
		$code='';
		for($i=0;$i<$this->charlen;$i++) $code.=$this->chars{mt_rand(0,$len-1)};
		$_SESSION['verificationcodevalue']=strtolower($code);
		$code = $code;
		$this->writeChar($code);
		//$this->writeArc(3);
		$this->writePix(20);
		$fun='image'.$type;
		$fun($this->img);
		*/
		$this->getCode(4,72,24);
	}
	
	function getCode($num,$w,$h) { 
		$code = "";
		for ($i = 0; $i < $num; $i++) { 
			$code .= rand(0, 9); 
		} 
		//4位验证码也可以用rand(1000,9999)直接生成 
		//将生成的验证码写入session，备验证时用 
		$_SESSION["verificationcodevalue"] = $code; 
		//创建图片，定义颜色值 
		header("Content-type: image/PNG"); 
		$im = imagecreate($w, $h); 
		$black = imagecolorallocate($im, 0, 0, 0); 
		$gray = imagecolorallocate($im, 200, 200, 200); 
		$bgcolor = imagecolorallocate($im, 255, 255, 255); 
		//填充背景 
		imagefill($im, 0, 0, $gray); 
	 
		//画边框 
		imagerectangle($im, 0, 0, $w-1, $h-1, $black); 
	 
		//随机绘制两条虚线，起干扰作用 
		$style = array ($black,$black,$black,$black,$black, 
			$gray,$gray,$gray,$gray,$gray 
		); 
		imagesetstyle($im, $style); 
		$y1 = rand(0, $h); 
		$y2 = rand(0, $h); 
		$y3 = rand(0, $h); 
		$y4 = rand(0, $h); 
		imageline($im, 0, $y1, $w, $y3, IMG_COLOR_STYLED); 
		imageline($im, 0, $y2, $w, $y4, IMG_COLOR_STYLED); 
	 
		//在画布上随机生成大量黑点，起干扰作用; 
		for ($i = 0; $i < 80; $i++) { 
			imagesetpixel($im, rand(0, $w), rand(0, $h), $black); 
		} 
		//将数字随机显示在画布上,字符的水平间距和位置都按一定波动范围随机生成 
		$strx = rand(3, 8); 
		for ($i = 0; $i < $num; $i++) { 
			$strpos = rand(1, 6); 
			imagestring($im, 5, $strx, $strpos, substr($code, $i, 1), $black); 
			$strx += rand(8, 12); 
		} 
		imagepng($im);//输出图片 
		imagedestroy($im);//释放图片所占内存 
	} 
	
}
